"经常会想 长大多好" meaning?

Im learning the TFBOYS song "青春修炼手册” as its very popular and easy to learn from.

So what does this line in the song mean?

"经常会想 长大多好"

Thank you in advance!

submitted by /u/xChuchx
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from r/ChineseLanguage: a community for people who are studying, teaching, or interested in Chinese! https://www.reddit.com/r/ChineseLanguage/comments/8r2uer/经常会想_长大多好_meaning/

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